document.writeln("       <tr>");
document.writeln("        <th>交易所</th>");
document.writeln("        <th>最新价格</th>");
document.writeln("        <th>最高价格</th>");
document.writeln("        <th>最低价格</th>");
document.writeln("        <th>买一</th>");
document.writeln("        <th>卖一</th>");
document.writeln("        <th>成交量</th>");
document.writeln("        <th>更新时间</th>");
document.writeln("        <th>操作</th>");
document.writeln("        </tr>");
